If the user is sophisticated, and has full control over the onboard hardware, this might be difficult. I am sure the satellites that will be built and marketed

If the user is sophisticated, and has full control over the onboard hardware, this might be difficult. I am sure the satellites that will be built and marketed for this specific use case will be hardened against interference by any third parties. And, since they are under no real jurisdiction once in orbit, enforcement would be impractical.